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avoid lifting more than once

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svn: r7364
This commit is contained in:
Robby Findler 2007-09-17 16:33:40 +00:00
parent 1654a0f03b
commit ac52b9f2ba
1 changed files with 22 additions and 60 deletions
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82
collects/mzlib/private/contract.ss
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@ -80,70 +80,32 @@ improve method arity mismatch contract violation error messages?
(string->symbol neg-blame-str) (string->symbol neg-blame-str)
(quote-syntax _)))]))))) (quote-syntax _)))])))))
(define-for-syntax (make-provide/contract-transformer contract-id id pos-module-source)
(make-set!-transformer
(λ (stx)
(with-syntax ([contract-id contract-id]
[id id]
[pos-module-source pos-module-source])
(syntax-case stx (set!)
[(set! id body) (raise-syntax-error
#f
"cannot set! provide/contract identifier"
stx
(syntax id))]
[(name arg ...)
(syntax/loc stx
((begin-lifted
(-contract contract-id
id
pos-module-source
(module-source-as-symbol #'name)
(quote-syntax name)))
arg
...))]
[name
(identifier? (syntax name))
(syntax
(begin-lifted
(-contract contract-id
id
pos-module-source
(module-source-as-symbol #'name)
(quote-syntax name))))])))))
#;
(define-for-syntax (make-provide/contract-transformer contract-id id pos-module-source) (define-for-syntax (make-provide/contract-transformer contract-id id pos-module-source)
(make-set!-transformer (make-set!-transformer
(let ([saved-id-table (make-hash-table)]) (let ([saved-id-table (make-hash-table)])
(λ (stx) (λ (stx)
(let ([key (syntax-local-lift-context)]) (let ([key (syntax-local-lift-context)])
(unless (hash-table-get saved-id-table key #f) (unless (hash-table-get saved-id-table key #f)
(with-syntax ([contract-id contract-id] (with-syntax ([contract-id contract-id]
[id id] [id id]
[pos-module-source pos-module-source]) [name (datum->syntax-object #f (syntax-object->datum id) id)]
(hash-table-put! [pos-module-source pos-module-source])
saved-id-table (hash-table-put!
key saved-id-table
(syntax-local-introduce key
(syntax-local-lift-expression (syntax-local-introduce
#'(-contract contract-id (syntax-local-lift-expression
id #'(-contract contract-id
pos-module-source id
(module-source-as-symbol #'name) pos-module-source
(quote-syntax id))))))) (module-source-as-symbol #'name)
(quote-syntax name)))))))
(with-syntax ([saved-id (syntax-local-introduce (hash-table-get saved-id-table key))]) (with-syntax ([saved-id (syntax-local-introduce (hash-table-get saved-id-table key))])
(syntax-case stx (set!) (syntax-case stx (set!)
[(set! id body) (raise-syntax-error [(name arg ...) (syntax/loc stx (saved-id arg ...))]
#f [name
"cannot set! provide/contract identifier" (identifier? (syntax name))
stx (syntax saved-id)])))))))
(syntax id))]
[(name arg ...) (syntax/loc stx (saved-id arg ...))]
[name
(identifier? (syntax name))
(syntax saved-id)])))))))
;; (define/contract id contract expr) ;; (define/contract id contract expr)
;; defines `id' with `contract'; initially binding ;; defines `id' with `contract'; initially binding